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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="boostbook.together"></a>Bringing Together a BoostBook Document</h2></div></div></div>
<div class="toc"><dl class="toc"><dt><span class="section"><a href="together.html#boostbook.linking">Linking in BoostBook</a></span></dt></dl></div>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boostbook.linking"></a>Linking in BoostBook</h3></div></div></div>
<p>How one links to another element in BoostBook depends
    greatly on the nature of the element linked and how the link
    should appear. There are three general linking elements:
    &lt;xref&gt;, &lt;link&gt;, and &lt;ulink&gt;. Additionally, there
    are linking elements for referencing specific types of entities,
    such as classes (&lt;classname&gt;), functions
    (&lt;functionname&gt;), or libraries (&lt;libraryname&gt;).</p>
<p>The &lt;xref&gt; element references elements that have an
    <code class="computeroutput">id</code> attribute and a title. The actual link text is
    composed from title and type of the element referenced. To link to
    a particular ID, create an &lt;xref&gt; element with the
    <code class="computeroutput">linkend</code> attribute set to the ID of the intended
    target. For instance, this section's ID is
    <code class="computeroutput">boostbook.linking</code>, so we create a reference it to
    with <code class="computeroutput">&lt;xref linkend="boostbook.linking"/&gt;</code>, which
    will look like this in the text: <a class="xref" href="together.html#boostbook.linking" title="Linking in BoostBook">the section called “Linking in BoostBook”</a>.</p>
<p>The &lt;link&gt; element references an ID in the same way as
    &lt;xref&gt;, except that &lt;link&gt; does not generate any text
    for the link, so text must be supplied within the element. For
    instance, we can again link to this chapter but this time specify
    our own text with <code class="computeroutput">&lt;link
    linkend="boostbook.linking"&gt;like this&lt;/link&gt;</code>. This
    markup will result in a link to this chapter that looks <a class="link" href="together.html#boostbook.linking" title="Linking in BoostBook">like this</a>.</p>
<p>The &lt;ulink&gt; element references a URL that is outside
    of the DocBook document. The <code class="computeroutput">url</code> attribute contains
    the URL to link to, and the element data provides the link
    text.For instance, we can link to the the Boost web site with
    <code class="computeroutput">&lt;ulink
    url="http://www.boost.org"&gt;Boost&lt;/ulink&gt;,</code> which
    appears in the document like this: <a href="http://www.boost.org" target="_top">Boost</a>.</p>
<p>In BoostBook, &lt;ulink&gt; supports a custom url schema for
    linking to files within the boost distribution. This is formed by
    setting the <code class="computeroutput">url</code> attribute to <code class="computeroutput">boost:</code>
    followed by the file's path. For example, we can link to the
    flyweight library with
    <code class="computeroutput">&lt;ulink
    url="boost:/libs/flyweight/index.html"&gt;Boost.Flyweight&lt;/ulink&gt;</code>,
    which will appear like this: <a href="../../../libs/flyweight/index.html" target="_top">Boost.Flyweight</a>.
    This schema is only supported for BoostBook &lt;ulink&gt; elements.
    It isn't available for any other elements or in Docbook.</p>
<p>The &lt;classname&gt;, &lt;functionname&gt;,
    &lt;methodname&gt;, and &lt;libraryname&gt; link to classes,
    functions, methods, and libraries, respectively. The text of each
    element gives both the name of the element to link to and the link
    text. For instance, we can link to the Function library with
    <code class="computeroutput">&lt;libraryname&gt;Function&lt;/libraryname&gt;</code>,
    which results in the following:
    <a class="link" href="../function.html" title="Chapter 16. Boost.Function">Function</a>. In cases where the displayed
    text is different from the actual name, the <code class="computeroutput">alt</code>
    attribute can be specified. For instance, the following XML
    element references the <code class="computeroutput"><a class="link" href="../boost/function.html" title="Class template function">boost::function</a></code>
    class template but displays the text <code class="computeroutput"><a class="link" href="../boost/function.html" title="Class template function">function</a></code>: <code class="computeroutput">&lt;classname
    alt="boost::function"&gt;function&lt;/classname&gt;</code>.</p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2005 Douglas Gregor<p>Distributed under the Boost Software License, Version 1.0.
      (See accompanying file LICENSE_1_0.txt or copy at
      <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>).
      </p>
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